Do Multivitamins Work? The Surprising Truth

Key takeaways

• Multivitamins are dietary supplements that provide a combination of vitamins and minerals, but their exact formulation varies by brand and product, and they are not tightly regulated by the FDA.
• Studies examining multivitamins and heart disease, cancer, brain function, and eye health show inconsistent findings, with some research suggesting benefits and others showing no effect or even potential risks.
• Multivitamins cannot replace a nutritious diet, yet certain groups — including older adults, vegans, and individuals with specific nutrient deficiencies — may benefit from supplementation, though excessive doses can be harmful.

Multivitamins and multiminerals are among the most widely used supplements globally.

Their use has risen steadily over the last few decades (1, 2).

Many people take them with the belief that they can enhance overall wellness, offset less-than-ideal eating patterns, and possibly lower the likelihood of chronic disease.

But Is it good to take a multivitamin everyday? The answer is not entirely straightforward. This article reviews the scientific evidence, explores potential benefits and risks, and helps clarify whether daily multivitamin use makes sense for you.

What are multivitamins?

Multivitamins are supplements formulated with a range of vitamins and minerals, and sometimes additional compounds (3).

Because there is no universal definition of what qualifies as a multivitamin, the nutrient profile differs depending on the manufacturer and specific product (3).

They may also be labeled as multis, multiples, or simply vitamins.

These supplements come in several formats, including tablets, capsules, chewable gummies, powders, and liquid preparations.

Most are intended for once- or twice-daily use. Always check the product label and adhere to the recommended dosage instructions.

You can purchase multivitamins at pharmacies, supermarkets, large retail chains, and online.

SUMMARYMultivitamins are supplements containing a variety of vitamins and minerals. They are sold in multiple forms and formulations.

What do multivitamins contain?

Thirteen vitamins and roughly 15 minerals are considered essential for human health (4).

These nutrients are required to produce enzymes and hormones, strengthen immune defenses, and maintain proper nerve and organ function (4).

Your body also depends on them for growth, reproduction, tissue repair, and regulation of countless biological processes.

Multivitamins may supply many of these essential nutrients — though the amounts can vary widely. Some formulas also include herbs, amino acids, or fatty acids.

Since the Food and Drug Administration (FDA) does not regulate dietary supplements as rigorously as prescription medications, certain products may contain higher or lower quantities of nutrients than what is listed on the label.

In addition, some ingredients can interact with medications, so it’s important to consult your healthcare provider before beginning a new supplement (5, 6).

Nutrients in multivitamins may be sourced from whole foods or produced synthetically, making it wise to choose products from reputable manufacturers that follow quality testing standards.

If you’re curious about how supplementation influences the body, you may find it helpful to read What happens to your body when you start taking vitamins for additional context.

SUMMARYBeyond vitamins and minerals, multivitamins can contain herbs, amino acids, and fatty acids — and their nutrient content varies by brand.

Multivitamins and heart disease

Heart disease remains one of the top causes of death worldwide (7).

Some individuals assume that daily multivitamin use may help protect cardiovascular health, but research findings are inconsistent.

Certain studies suggest that multivitamins are associated with a lower risk of heart attacks and death, while others report no measurable benefit (8, 9, 10, 11).

The Physicians’ Health Study II followed over 14,000 middle-aged male doctors for more than a decade and found that daily multivitamin use did not reduce heart attacks, strokes, or mortality (12).

However, a newer study observed that women who took a multivitamin for longer than 3 years had a lower risk of dying from heart disease (13).

Overall, when asking, Is it good to take a multivitamin everyday for heart protection, the evidence remains mixed and does not conclusively support routine use for cardiovascular prevention.

SUMMARYSome research links multivitamin use to a lower risk of heart disease, but other studies show no clear benefit.

Multivitamins and cancer

Research evaluating multivitamins and cancer risk also shows conflicting outcomes.

Some studies indicate no impact on cancer incidence, while others associate multivitamin use with either increased or decreased risk (9, 11, 14, 15).

A review of five randomized controlled trials including 47,289 participants found a 31% lower cancer risk among men taking multivitamins, but no significant effect in women (16).

Two observational studies — one involving women only and another including both men and women — associated long-term multivitamin use with a reduced risk of colon cancer (17, 18).

Additionally, the Physicians’ Health Study II reported that prolonged daily multivitamin use lowered cancer risk in men with and without a prior history of cancer (19).

While there may be potential Benefits of taking vitamins everyday, the data does not definitively confirm that multivitamins prevent cancer in the general population.

SUMMARYSome evidence suggests multivitamins may reduce cancer risk, while other research finds no significant benefit.

Do multivitamins have any other health benefits?

Beyond heart disease and cancer, multivitamins have been examined for their effects on cognitive performance and vision health.

Brain function

Several small studies focusing on specific groups suggest that multivitamins may enhance memory in older adults (20, 21, 22).

They may also influence mood. Research has identified connections between nutrient deficiencies and low mood, as well as between supplementation and reduced symptoms of anxiety and depression (23, 24, 25, 26, 27, 28).

However, other trials have found minimal or no improvement in mood (29,30).

Eye health

Age-related macular degeneration is a major cause of blindness worldwide (31).

One study found that antioxidant vitamins and minerals may slow its progression and aid in prevention (32, 33, 34).

Some evidence also suggests that multivitamins could lower the risk of cataracts, another common eye condition (35, 36, 37).

SUMMARYMultivitamins may support memory and mood in certain populations. Antioxidant vitamins and minerals might help slow diseases that cause blindness.

Multivitamins may be harmful in some cases

Dosage is a critical consideration when deciding whether it is good to take a multivitamin everyday.

While some individuals tolerate higher intakes of specific nutrients, excessive amounts can be dangerous.

The correct dose partly depends on whether a vitamin is water-soluble or fat-soluble:

• Water-soluble. Excess amounts are generally excreted in urine.
• Fat-soluble. Because the body cannot easily eliminate these, extra amounts may accumulate in the liver.

Pregnant women must be particularly cautious with vitamin A, as high intakes have been associated with congenital disabilities (38).

Vitamin D toxicity is uncommon and unlikely to result from multivitamin use. However, vitamin A toxicity occurs more frequently (39, 40, 41, 42).

If you already consume a nutrient-rich diet and add a high-potency multivitamin, you may surpass recommended daily intake levels.

Smokers should avoid multivitamins containing high amounts of beta carotene or vitamin A, as these may raise lung cancer risk (43, 44).

Large doses of minerals such as iron can cause stomach discomfort, constipation, vomiting, and fainting. Iron may also interfere with zinc absorption (45).

Men should monitor iron intake carefully, as they tend to store more iron than women, as well as individuals with hemochromatosis.

This disorder can result in toxic mineral buildup and may cause liver cirrhosis, liver cancer, and heart disease. People with this condition should also avoid vitamin C supplements (45).

Another concern is manufacturing errors, which could lead to multivitamins containing significantly higher nutrient levels than intended (46).

SUMMARYTaking large doses of certain nutrients can be harmful, particularly when combining high-potency supplements with a nutrient-dense diet.

Should you take multivitamins?

Multivitamins are not appropriate for everyone and may even pose risks for some people.

However, certain groups could benefit, including:

• Older adults. Absorption of vitamin B12 may decline with age. Older adults may also require additional calcium and vitamin D (47, 48).
• Vegans and vegetarians. Because vitamin B12 is primarily found in animal products, plant-based eaters have a higher risk of deficiency. They may also lack calcium, zinc, iron, vitamin D, and omega-3 fatty acids (49, 50).

Others who may benefit include individuals who have undergone weight loss surgery, follow low calorie diets, or do not obtain sufficient nutrients from food alone (51, 52).

Ultimately, if you’re wondering, Is it good to take a multivitamin everyday, the answer depends on your diet quality, health status, and specific nutrient needs.

SUMMARYSome groups — such as older adults, vegetarians, and vegans — may require higher amounts of certain vitamins or minerals.

The bottom line

Multivitamins are not a shortcut to optimal health.

Evidence supporting their benefits for most people is inconsistent, and in some circumstances, they may even cause harm.

If you have a confirmed nutrient deficiency, targeting that specific nutrient is typically more effective than taking a broad multivitamin.

Before starting a daily supplement, speak with your healthcare provider to determine the safest and most appropriate approach for your individual needs.

Most importantly, avoid relying on multivitamins to compensate for an unhealthy diet. Consuming a balanced diet rich in whole, minimally processed foods remains the most reliable strategy for long-term health and disease prevention.